. Bulletin of the British Museum (Natural History), Geology. . Fig. 10 Paraglauconia carbonaria (Roemer, 1836). 1, original figures of Potamides carbonarius given by Roemer (1836); a, b show the typical form according to Roemer and c, d, e provide details of single whorls of several varieties. 2, original figures of Melania strombiformis Schlotheim (in Dunker 1846: pi. 10, figs 17-19), respectively showing, according to Dunker, the common form, a more noded variety, and a higher-whorled, less ornamented form. term that was used to describe a particular German fades which is now regarded as equ
. Bulletin of the British Museum (Natural History), Geology. . Fig. 10 Paraglauconia carbonaria (Roemer, 1836). 1, original figures of Potamides carbonarius given by Roemer (1836); a, b show the typical form according to Roemer and c, d, e provide details of single whorls of several varieties. 2, original figures of Melania strombiformis Schlotheim (in Dunker 1846: pi. 10, figs 17-19), respectively showing, according to Dunker, the common form, a more noded variety, and a higher-whorled, less ornamented form. term that was used to describe a particular German fades which is now regarded as equivalent to the English Purbeckian and has been replaced by the term 'Biickeberg Sequence' (Kemper 1973a: 333). In a further paper, Kemper (19736: 52, 57) has recorded the occurrence of 'carbon- aria' with other molluscan species in the Biickerberg Folge 1 [Berriasian ], which comprises the Cypridea granulosa fasciculata and C. granulosa vidrana Subzones. Remarks on nomenclature. Although all earlier authors have accepted the designation of strombiformis (Schlotheim) as the type species of Paraglauconia, the validity of this must be in question. Morter (1978: 22) has pointed out that the name Muricites strombiformis Schlotheim is invalid under Article 12, is there is neither 'a description, definition, or indication' as to the identity of this species in Schlotheim's original account (1820: 144-5). The translated descrip- tion contains nothing that might be regarded as descriptive of this fossil: From Neustadt in the Riibenberge, Vorharz, and probably from the older formations Beautiful speci- mens, still partly covered by rock in considerable lumps, partly free, apparently completely preserved and preserving the aperture [20 specimens]. This probably belongs to the genus Cerithium Lamarck, and up till now has always been cited as a Strombite and has become so known as such that no further description is necessary. It comes from the Riibenberge, in complete petrified shell be
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